<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="js/vue.js"></script>
</head>
<body>
    <!-- vue的事件修饰符----once -->
    <div id="app">
        <button @click.once="handleClick">once</button> 
        <!-- once 只执行一次 -->
    </div>
    <script>
        let app = new Vue({
            el: "#app",
            data: {
            },
            methods: {
               handleClick(){
                   console.log("do once")
               }
            }
        })
    </script>
</body>
</html>